I know Marty doesn't appreciate trade speculation, since they have spent way too much time and money over the years on the 464 to ever want to let it go. At this point, official policy is absolutely not when it comes to talk about letting the 464.
I suspect that the only way they would ever even consider it would be if someone were to pay the full freight for Scott Lindsey or another contract restorer to do a ground up restoration of the Quincy & Torch Lake 2-6-0 that's in pieces out behind the Huck's shop.
If you don't have at least $500,000 in up front money, don't even think about it!